如何重定向到预定义的错误页?

好吧,你 可以 当然,如果需要,可以通过编程方式从web.config文件中获取设置。- http://msdn.microsoft.com/en-us/library/system.configuration.configurationsectiongroup.aspx -粗略代码:

    string my404Setting;

    // Get the application configuration file.
    System.Configuration.Configuration config =
        ConfigurationManager.OpenExeConfiguration(
        ConfigurationUserLevel.None);

    foreach (ConfigurationSectionGroup sectionGroup in config.SectionGroups)
    {
        if (sectionGroup.type == "customErrors" )
        {
            foreach (ConfigurationSections section in sectionGroup.Sections)
            {
               if (section.StatusCode = "404")
               {
                  my404Setting = section.Redirect;
                  break;
               }
            }
            break; 
        }
    }
}

比应该的更丑,但这就是你读你想要的东西的方式。

从这里回答: Best way to implement a 404 in ASP.NET

protected void Application_Error(object sender, EventArgs e){
  // An error has occured on a .Net page.
  var serverError = Server.GetLastError() as HttpException;

  if (null != serverError){
    int errorCode = serverError.GetHttpCode();

    if (404 == errorCode){
      Server.ClearError();
      Server.Transfer("/Errors/404.htm");
    }
  }
}

不,不幸的是,这些路径只适用于静态页面路径。